<!DOCTYPE html>
<html>
<head>
    <style type="text/css">
        html {color:black;}
        p {color:blue;}
        h2 {color:silver;}
    </style>
</head>

<body>
<h1>这是 heading 1</h1>
<h2>这是 heading 2</h2>
<p>这是一段普通的段落。</p>
</body>
</html>